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Postfix Documentation
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8 - Configuring Postfix to send and receive mail via virtual interface

Alternatively, you can use the Postfix system to send AND receive mail while leaving your Sendmail setup intact, by running Postfix on a virtual interface address. Simply configure your mail user agent to directly invoke the Postfix sendmail program.

In the /etc/postfix/ main.cf file, I would specify

/etc/postfix/
main.cf:
    
myhostname = virtual.host.tld
    
inet_interfaces = $
myhostname
    
mydestination = $
myhostname

Follow the instructions in the " Mandatory configuration file edits" in section 10, and review the "To chroot or not to chroot" text in section 11.

Start the Postfix system:

# postfix start

or, if you feel nostalgic, use the Postfix sendmail command:

# sendmail -bd -qwhatever

and watch your maillog file for any error messages. The pathname is /var/log/maillog, /var/log/mail, /var/log/syslog, or something else. Typically, the pathname is defined in the /etc/syslog.conf file.

% egrep '(reject|warning|error|fatal|panic):' /some/log/file

Note: the most important error message is logged first. Later messages are not as useful.

In order to inspect the mail queue, use one of the following commands:

% mailq

% sendmail -bp

% postqueue -p

See also the " Care and feeding" section 12 below.

Postfix Documentation
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